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TitreGrain2: predictions of particle size seaward of River Mouths
AuteurSyvitski, J P M; Alcott, J M
SourceComputers and Geosciences vol. 19, no. 3, 1993 p. 399-446, https://doi.org/10.1016/0098-3004(93)90094-l
Année1993
Séries alt.Commission géologique du Canada, Contributions aux publications extérieures 18392
ÉditeurElsevier BV
Documentpublication en série
Lang.anglais
DOIhttps://doi.org/10.1016/0098-3004(93)90094-l
Mediapapier; en ligne; numérique
Formatspdf
ProvinceNunavut
SNRC27C; 27D
Lat/Long OENS -72.0000 -64.0000 70.0000 69.0000
Sujetslogiciel; applications par ordinateur; analyse granulométriques; établissement de modèles; transport des sediments; sedimentation; géomathématique; sédimentologie
Illustrationscomputer programs; formulae
Résumé(disponible en anglais seulement)
An ANSI standard FORTRAN-77 numerical model is provided. The model predicts the spatial and temporal change in seafloor particle size seaward of a river mouth. The model needs the input files generated by a sister program DELTA2, a 2-D model that simulates the progradation of a river delta and the resultant fill of one or more marine basins. GRAIN2 tracks four size fractions in the mud-size range: coarse silt, medium silt, fine silt, and clay. Their spatial distribution is determined using (1) a velocity distribution developed from a buoyancy-dominated, free, 2-D jet flowing into a highly stratified marine basin; and (2) a particle-scavenging model that takes into account the biogeochemical affects of settling of particles in a marine environment (i.e. flocculation). This hemipelagic component is predicted seasonally (four times a year) based on fluctuations in river velocity and river mouth shape, and on the suspended load discharged into the sea. Sand deposition is predicted from the seasonal rate of turbidity current deposition, and from DELTA2. The model is sensitive to changes in river mouth position and thus sediment supply and sea level fluctuations.
GEOSCAN ID134147